The Undermountain is a dangerous, unforgiving place, with few chances for respite. The Fungus Garden offers one such opportunity– a cavern filled with a field of mushrooms and Myconids, patiently tended by a lone Drow druid.
The Fungus Garden is an encounter fashioned for travels in Undermountain or in the Underdark, although with minor changes it can be adapted... [click here for more]

Now with even more Villains and Lairs!
Expand your game with this collection of 56 NPCs of various Challenge Ratings, thirteen of which include maps and details of their lairs. Add these NPCs as a side-quest, a main villain, a one-shot, a bounty for easy money, or however else you wish. Written by some of the best-selling authors on the Dungeon Masters Guild and outstanding podcasters,... [click here for more]

MAD MAGES OF UNDERMOUNTAIN
Are you a DM planning your adventurers' next delve into Undermountain?
Mad Mages includes five fully fleshed out mages who inhabit Halaster's halls. Each entry includes the NPC mage's description, backstory, motivation, goals, cohort and lair, complete with keyed map.
It also includes:
Descriptions... [click here for more]

Undermountain: The Lost Lore is a collection of 8 new character archetypes, 3 backgrounds, 15 spells, 19 magic items, 8 monsters and a host of random dungeon dressing tables to bring your Undermountain experience to life.
The content is intended for use with the Waterdeep: Dungeon of the Mad Mage hardcover, but could easily be interouced as part of any Undermountain... [click here for more]

Waterdeep: Dungeon of the Mad Mage provides the bare bones of the town of Skullport but doesn’t flesh out any interesting combat encounters. Your players will likely feel the combat “itch” as they explore this subterranean venue. Here are three varied, challenging encounters so they can scratch it.
Xanathar Brawl – a medium encounter... [click here for more]

In my adventure Undermountain: The Caverns of the Many-Legged, a number of unique NPCs and monsters are featured, each with their own stat block. This includes chitine warriors, a choldrith queen, a spellcasting draegloth, and the drider-like matron mother of House Szard'lin. Happy to place the descriptions and stat blocks of these creatures on the DMs Guild for free.
And please... [click here for more]